1 March 1991 Defocused white light speckle method for object contouring
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Proceedings Volume 1385, Optics, Illumination, and Image Sensing for Machine Vision V; (1991) https://doi.org/10.1117/12.25362
Event: Advances in Intelligent Robotics Systems, 1990, Boston, MA, United States
Abstract
White light speckles observed when the object is coated with retroreflective paint and illuminated by an ordinary slide projector or other white light source are used for object contouring using the defocus effect. Due to a defocussed recording of the speckles on the object it is seen that the high frequency components of the speckles are eliminated due to the enlarged size of speckles. A suitable filter on the Fourier plane of a single exposed speckle pattern of a curved object can deli neate the regions above and below the cutoff frequency as dark and bright areas respectively. A digital counterpart of this effect is also demonstrated.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Anand Krishna Asundi, "Defocused white light speckle method for object contouring", Proc. SPIE 1385, Optics, Illumination, and Image Sensing for Machine Vision V, (1 March 1991); doi: 10.1117/12.25362; https://doi.org/10.1117/12.25362
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